Note 3 - Securities (Details) - Remaining Contractual Maturity of Securities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Remaining Contractual Maturity of Securities [Abstract]
One year or less	$ 10,974
One year or less	10,552
One year or less	3,817
One year or less	4,030
After one year to five years	312,235
After one year to five years	300,232
After one year to five years	9,548
After one year to five years	10,082
After five years to ten years	113,812
After five years to ten years	109,437
After five years to ten years	6,999
After five years to ten years	7,390
After ten years	105,106
After ten years	101,065
After ten years	10,009
After ten years	10,569
Securities that do not have a single contractual maturity	680,598
Securities that do not have a single contractual maturity	702,200
Securities that do not have a single contractual maturity	0
Securities that do not have a single contractual maturity	0
Total	1,222,725	1,080,574
Total	1,223,486	1,082,403
Total	30,373	34,295
Total	$ 32,071	$ 36,023